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"hMSH2-hMSH6 forms a hydrolysis-independent sliding clamp on mismatched DNA."

Gradia S, Subramanian D, Wilson T, Acharya S, Makhov A, Griffith J, Fishel R



Published Jan. 1, 1999 in Mol Cell volume 3 .

Pubmed ID: 10078208

Abstract:
Mismatch recognition by the human MutS homologs hMSH2-hMSH6 is regulated by adenosine nucleotide binding, supporting the hypothesis that it functions as a molecular switch. Here we show that ATP-induced release of hMSH2-hMSH6 from mismatched DNA is prevented if the ends are blocked or if the DNA is circular. We demonstrate that mismmatched DNA provokes ADP-->ATP exchange, resulting in a discernible conformational transition that converts hMSH2-hMSH6 into a sliding clamp capable of hydrolysis-independent diffusion along the DNA backbone. Our results support a model for bidirectional mismatch repair in which stochastic loading of multiple ATP-bound hMSH2-hMSH6 sliding clamps onto mismatch-containing DNA leads to activation of the repair machinery and/or other signaling effectors similar to G protein switches.


This publication refers to following REPAIRtoire entries:

Proteins


Last modification of this entry: Oct. 6, 2010

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